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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Balance the Following Equation : Fe + O2 → Fe3 O4 - Chemistry

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प्रश्न

Balance the following equation :

 Fe + O2 → Fe3 O4

एका वाक्यात उत्तर

उत्तर

3Fe + 2O2 → Fe3O4

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पाठ 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 4.1

संबंधित प्रश्‍न

State one characteristic of the chemical reaction which takes place when wax is burned in the form of a candle?


Is Electrolysis of water an endothermic reaction or an exothermic reaction?


Is Decomposition of calcium carbonate an endothermic reaction or an exothermic reaction?


Balance the following equation .

N2 + O2 → NO


Choose the correct answer from the options given below.

The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of chlorine gas formed.


Write word equation for the following molecular equation:

CuCo3 → CuO + CO2 [g]

Word equation:

State the characteristics or indications occurring in the above reaction.


Balance the following simple equation:

Al  +   H2SO4  →   Al2(SO4)3   +   H2 


Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSOand NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?

  1.  In beakers A and B, exothermic process has occurred.
  2. In beakers A and B, endothermic process has occurred.
  3. In beaker C exothermic process has occurred.
  4.  In beaker C endothermic process has occurred.

A student took a small amount of copper oxide in a conical flask and added dilute hydrochloric acid to it with constant stirring. He observed a change in colour of the solution. 

  1. Write the name of the compound formed and its colour.
  2. Write a balanced chemical equation for the reaction involved.

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